Connecting plug



FIG. 1 is a front, top and right side perspective view of a connecting plug showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The features shown by broken lines are included to show unclaimed subject matter and form no part of the claimed design. 

The ornamental design for a connecting plug, as shown and described. 